Homer Site (BMRP) (Cretaceous of the United States)

Where: Custer County, Montana (45.7° N, 104.9° W: paleocoordinates 52.2° N, 78.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; paleosol/pedogenic, silty mudstone and fine-grained, green siltstone

• "rapidly-deposited overbank sediments on a wet flood plain"
• "The bone-bearing layer is 0.5 m thick and lies at the base of a massive, 3m thick, organic rich mudstone which rests sharply but conformably above a green, fine-grained siltstone. The enclosing mudstone contains 58% silt, 33% clay, and 9% very fine sand and exhibits popcorn weathering which is typical of Hell Creek mudstones. No sedimentary structures were observed in the quarry sediments; however, some pedogenic features such as small root traces and slickensides are present."

Size classes: macrofossils, mesofossils

Collected by BMRP in 2005-2007

Collection methods: bulk, surface (in situ), mechanical, sieve,

Primary reference: J. C. Mathews, S. L. Brusatte, S. A. Williams and M. D. Henderson. 2009. The first Triceratops bonebed and its implications for gregarious behavior. Journal of Vertebrate Paleontology 29(1):286-290 [M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 88990: authorized by Matthew Carrano, entered by Matthew Carrano on 27.04.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. de Lacep├Ęde 1803 gar
 Avetheropoda - Tyrannosauridae
Tyrannosaurus sp. Osborn 1905 tyrant lizard
 Neornithischia - Ceratopsidae
Triceratops sp. Marsh 1889 ceratopsid
117 specimens
 Choristodera -
Champsosaurus sp. Cope 1876 choristodere